Radio transmitting arrangement



@CL 8, 1940. E, sTUTlUs 2,217,424

RADIO TRANSMITTING ARRANGEMENT Filed March 3, 1958 #Marmara/2'- 1.1 a l i Patented Oct. 8, v1947.0 'v

f l' fnAmo TRANSMITTING aanslaanMxiN'r `Erich statins, Berlin, Germany, assignor toC. Lorenz Aktiengesellschaft,l Berlin-Tempelhof,

'Lorenz'wegg Germany, a company' Application March s, 193s, serial No. 193,641 In Germany April 1.2,I 1937 i n ironas.' (or ,250;11)i

The present invention is an improvement upon radio beacons fof the `kinddisclosed`in United States Patent 2,028,510, vissuedv January 21,1936.

VThe arrangements there speciedby way of example comprise a continuously fed transmitting dipole and two reflecting dipoles arranged to be periodically and alternately interrupted by relaycontacts, each reflecting dipole thus being subjected -to a keying operation in accordance withthe oper-v ation of the'relays controlling these contacts'and therefore designated as keying'relays.` One of such relays is a working relay, its contact being a make contact, While the other is a resting relay, its' contact being a break'contact. lIn this way it is possible with the aid of lsimple means tofpro'- vide for a keying operation -by which signals of -one` kind and signals of a second kind are'produced in such successionv that the -signals of` each kind arevoriginated in the intervals between those of the other kind, whereby the two `signals, being complementary to each other, shall constitute a combination signal of equal jfeld intensityandy therefore designated as continuous dash line.y vThis vsignal 'enables aircraft pilots yto ascertainy y Q5.

whether they are on or -ofi the'course to be followed, since when leaving this course either one or 'the other kind of 'complementary'. signal will 'preponderatal i It is however diliicult so to adjust theI keying vrelays of these arrangements that anys two of the l complementary signals shall be precluded from overlapping each other. This is mainly due to the jfact that' the material from which thecontac't springs of the relays are made is not of the same quality or properties throughoi'iti` ATherefore UnitedStates Patent`2,072,268, issued March, 2, 1937, propos'esthat the circular radiation characl teristic or lpattern of the transmitting dipole,

that is, the radiation pattern produced when both n reflecting antennae are ineffective, be calculated to extend through the pointsofintersection of ,the two directional radiation patterns, that is`,the patterns which are alternately'produced by keying the reflecting antennae, jumps inthe field 'ist strength thus beingy prevented'. [,Injthis Vway it is rendered possible so to adjust thej keying relays that the reflectingantennae' shall not bcome effective'simultaneously, tolerances, that'is, short periods being provided during which both reflectors are neective. y The invention'provides'for 'regulating in a simple manner the pull-gup, and release timeslof 4the keying, relays, thus `enabling the said tolerances [to be adjusted. A subidiaryjfeature of. 'the in- `vention resides in the provision of a ychecking device bywhichthe adjustment tor kwhich there' lays and hence the said tolerances are subjected can be ascertained.

In accordance with the invention the pull-up and release times of the keying relays are regureflector is ineffective.

lated with the adof resistances and an auxiliary.

relay which atA a certain instant of time acts to yconnect these resistances-in parallel with' y.the f l windings of the keying relays. This auxiliary relay vis slow-acting, its-time lag howeverbeing so' calffk culatedthat` the contacts of this relay hallnot affect the ykeying operation.

The invention'will be? understood from the fol? l y lowing description, reference'being had to the `ac,y 'companying drawing showing one embodiment of ftheinvention v y The antenna..:arrangement` comprises a .dipole E, which in the operationof the" arrangement is Sli) continuously fed from a high frequency generator p S, and two reiiecting dipoles I, II intended alter` nately to, be rendered eective and ineffective so that 'by` means of each-of these reiiectors signals areprodu'ced in Vtheintervals in which the other keying reec'tor -I is designated A while the rest'- `ing relay employed. for keying ther reflector II isY designated R.' Relay A has a contact TA, located j in dipole I, While-relay Rlhas a contact TR that `:forms part of dipole II.'- These relays are. in'-," cluded in a circuit which also contains a slowacting relay H, this being the aforesaidauxiliary tery B. With the key T` opened, as shown, both relays are in their state of deenergization in which contact TA is open while contact TR is'closed.vv `'The pull-up times of bothrelays can be adjusted The working relay forff 'relayjafvariable resistance e, a keyT, and a batywith the air-of variableresistances a, b, whereas l I the release times thereof rare regulable by means `of variable resistances c, d. These resistances are connected to each other and to battery B andv relays "A, vR through certain vcontacts hl and h2 lin such manner that WithhlfandhZ in the posi-` tions "shown resistors c and d shunt the windings of relays A and R'respectively, whereas with conf' y tacts 'h| and h2 shifted rsistances aand 'hf Vshunt the windings 'of relays A and R respectively,

las'clearly shown in the drawing. hl and h2 are two contacts of relayH which are arranged as changeover contacts. Theobject of adjustingl in this way boththe keying signals vand the said tolerar'icesv is,

to nish the signals abruptly and tol commence them slowly, in order thereby toprecludey the reflectors frombecoming. eifective simultaneously.

From this it .follows that relay A must be sluggish i in-attracting vits armature Awhile dropping it quickly, and furthenthat relay R must be Slllgf gish in dropping its armature while attractingfit quickly. Therefore, resistance aactingyto regu-i late thexpull-up time of relay A, must be rela? tively low while resistance c,by,which' the re#1 lease;time of, this relay is regulated,`1nust be'relatively high; similarly, resistance4 bl, actingto'reguwhereas resistance d, having to regulate V'the release time of relay R, should be low. Relay H al- ,laterne Ypull-uptime.. of relay R, should b yhigh though slow-acting switches its contacts within the time taken for producing a signal by depressing the key T, whereby these contacts can not aiect the keying operation.

Resistance e serves for adjusting the time lag of relay H. f 1

This adjusting device is preferably arranged in the transmitter room. The terminals I, 2, 3 of this device, which are located in such room, are by suitable lines Ll, L2, L3 connected to the ter minals I', 2', 3' of the antenna arrangement E, I,

The arrangement shown in the right hand porftion of the drawing has for its .object Vto check the short intervals during which both contacts TA, TR are opened. The permissible variations in the length of any suchrshort intervalmay be speciiied by maximum and vminimum tolerance limits t2 and tl. The checking device shown at the right of the drawing may be used to check at any time whether the actual lengths of the intervals are between theV specified tolerance limits, such checking beingv performed both with respect to the interval betweenthepull up of relay R and that of relay A,when`key T is closed and also with respect to the interval between the release of relayA and that of relayR when key T is opened. The indications are given by a glow lamp which lights kor fails to light dependent upon whether the intervals being checked are longer or shorter than the tolerance limit with respect to which the test is made.

The contacts TA, TR are so connected to points 4, 5 of a bridge 6, 1,8, 9 that the spacebetween the points 4, v5 is bridged over if any one of these contacts is closed. By such contact closure the parts Cl, C2, G are short-circuited, the energy .of bridge battery B owing Within the bridge since either closedcontact TA or closed contact TR, as the ca seY may be, is included therein. `However from the instant of opening one of these contacts up to the instant of closing the other the space between points 4, 5 will not be bridged. This interval, during which in this way the points 4, 5 arenot interconnected by either one or the other of the contacts TA, TR is to be within the tolerance tZ-tL To determine whether the actual length of the interval is between the upper and lower tolerance limits t2 and tl, the switch S3 is closed to connect bridge battery B in circuit and the switch S2 is moved to make contact with rst the contact t2 and then the contact tl'. If the actual lengths of the intervals .(during which bothrreiiectors I and II Vare ineffective) is between the specied limits t2 and tl the grid glow lamp G should ash at each opening Vor closing ofthe key T when the switch VS2 is set tothe upper Vcontact tl but shouldfail tor flash when the switch S2 is set to the lowercontact t2.

The manner in whichsuch operation takes place is as follows: The momentary interruption of the bridge between pointsi and 1, which results from the vsimultaneous opening condition of contacts TA and TR, causes battery B' to charge either the condenser Cl or condenser C2 over resistancesl Rl, R2, depending ywhether switch S2 has been brought to rest against contact tl' 'or contact t2. `'The voltage of these condensers,

being dependent upon thejcapacity and duration of the charge, is so chosen that the `duration tl or t2, as the case mayV be, shall cause the ignition voltage of the glowf'larnp G to be attained, this lamp thus being lit accordingly to indicate that the desired duration tl or t2 is effective.

A voltmeter V is arranged to indicate the voltage .of battery B which is switched in by means of a switch S3.

h denotes a change-over contact of relay H. This contact` may be a third contact thereof, being provided in addition to the contacts hl h2, or may be either one or the other of these two. In each case such contact h is connected in parallel with the contacts TA, TR over a handoperated switch SI, those openings of circuit 4 5 corresponding to the differences of time involved in the release of the relays A, R or else those circuit openings corresponding to the differences in the operating times of these relays are bridged over depending whether switch SI is brought to rest against contact t or Contact u. vThe arrangement h, Sl, t, u may thus servefor ascertaining the pull-up and release times of the keying relays independently of each other.

What is claimed is: f

1. Radio transmitter arrangement comprising a main antenna, a high frequency generator `coupled thereto, two reecting antennaen for modiying the radiation of saidmain antenna, a working relay having a make contactconnected in one of said reflecting antennae, a resting relay having a break contact connected in the other oi' said reecting antennae, a circuitfor energizing said relays, keying means for opening and closing said circuit, two auxiliary make contacts and two auxiliary break contacts, an auxiliary relay connected insaidcircuit tol be energized and deenergized by Vsaid keying meansand adapted to open said auxiliary break contacts vand close said auxiliary make contactsv in response to said energization and deenergization with a delay sufficiently great so that the rapidity of the lactua-- `tion of such contacts exerts no influence upon the rapidity of. responserof said 'working and resting relays, adjustable resistances connected in parallel with the working and resting relays through said auxiliary relay make contacts for Acontrolling the operating time. of said working andv resting relays, and further resistances connected in parallel with said working and resting relays through said auxiliary relay break contacts for controlling the release time of said'working and resting relays. f

2. An arrangement according to, claim 1, comprising condensers, afglow lam'p undercontr-ol of these condensers, and means underV control of the working and resting relays for charging such con`- VdensersI during the intervals ,in which both said relay contacts are opened.

3. An arrangement according to'` `claim 1,1 comprising condensers, a switchto'connect either one or another of these condensers'with said relays, means under control of the `working and resting relays for`charging said condensers during the intervals in which both said relay contacts areopen, and a glowlamp under control of the charged condenser.'

4. An arrangement according to claim l, comprising condensers, a glow lamp undercontrol of these condensers, means under control of the working and resting relays for charging said condensers during the Aintervals `in which bot said relay contacts are open, and a switch adapted to connect achange-over contactof the said auxiliary relay in parallel with said relay contacts. Y e Q Y ERICH STUTIUS. 

